package com.example.mqspring.rabiitmqbasicleverone.rabbitmqDistribute;

import com.example.mqspring.utils.RabbitMqUtil;
import com.rabbitmq.client.*;
import org.springframework.util.ResourceUtils;

import java.io.*;
import java.net.HttpURLConnection;
import java.net.URL;

/**
 * 根据应答机制 连续消费生产者产生的消息
 */
public class Consumer extends DefaultConsumer {

    static private String queue = "bobotest";
    /**
     * @param channel the channel to which this consumer is attached
     */
    public Consumer(Channel channel) {
        super(channel);
    }

    @Override
    public void handleDelivery(String consumerTag, Envelope envelope, AMQP.BasicProperties properties, byte[] body) throws IOException {
        String s = new String(body);
        System.out.println("URL DOWNLOAD:"+s);
        try {
            download(s);
        } catch (Exception e) {
            e.printStackTrace();
        }
        getChannel().basicAck(envelope.getDeliveryTag(),false);
        System.out.println("ACK sent");
        System.out.println("wait for next download");
    }

    public void download(String urlstr) throws Exception {
        URL url = new URL(urlstr);
        HttpURLConnection conn = (HttpURLConnection)url.openConnection();
        //设置超时间为3秒
        conn.setConnectTimeout(3*1000);
        //防止屏蔽程序抓取而返回403错误
        conn.setRequestProperty("User-Agent", "Mozilla/4.0 (compatible; MSIE 5.0; Windows NT; DigExt)");
        //得到输入流
        InputStream inputStream = conn.getInputStream();
        //获取自己数组
        byte[] getData = readInputStream(inputStream);
        String path = ResourceUtils.getURL("classpath:").getPath();
        //文件保存位置
        File saveDir = new File(path+"/download");
        if(!saveDir.exists()){
            saveDir.mkdir();
        }
        final long l = System.currentTimeMillis();

        File file = new File(saveDir+File.separator+l+"xiazaibook.png");
        FileOutputStream fos = new FileOutputStream(file);
        fos.write(getData);
        if(fos!=null){
            fos.close();
        }
        if(inputStream!=null){
            inputStream.close();
        }
        System.out.println("info:"+url+" download success");
    }
    public static  byte[] readInputStream(InputStream inputStream) throws IOException {
        byte[] buffer = new byte[1024];
        int len = 0;
        ByteArrayOutputStream bos = new ByteArrayOutputStream();
        while((len = inputStream.read(buffer)) != -1) {
            bos.write(buffer, 0, len);
        }
        bos.close();
        return bos.toByteArray();
    }
    public static void main(String[] args) {
        Connection connection = RabbitMqUtil.createConnection();
        Channel channel = null;
        try {
            channel = connection.createChannel();
            Consumer consumer = new Consumer(channel);
            String s = channel.basicConsume(queue, false, consumer);
            channel.basicCancel(s);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}
